#1434 Added support for ZMSCORE new in Redis 6.2 RC (#1437)

* #1434 Added zmscore command support

* #1434 Fixed typo and doc

* #1434 Set [] as default value for members arg in zmscore func

* #1434 Set None as default value for members arg in zmscore func

* #1434 Removed default value for members arg in zmscore func

* Fixed flake8 formatting

Co-authored-by: jiekun.zhu <jiekun.zhu@shopee.com>

Author: Jiekun

Diff for: redis/client.py

@@ -390,6 +390,11 @@ def parse_zscan(response, **options):
     return int(cursor), list(zip(it, map(score_cast_func, it)))
 
 
+def parse_zmscore(response, **options):
+    # zmscore: list of scores (double precision floating point number) or nil
+    return [float(score) if score is not None else None for score in response]
+
+
 def parse_slowlog_get(response, **options):
     space = ' ' if options.get('decode_responses', False) else b' '
     return [{
@@ -705,6 +710,7 @@ class Redis(Commands, object):
         'XPENDING': parse_xpending,
         'ZADD': parse_zadd,
         'ZSCAN': parse_zscan,
+        'ZMSCORE': parse_zmscore,
     }
 
     @classmethod

Diff for: redis/commands.py

@@ -2461,6 +2461,20 @@ def zunionstore(self, dest, keys, aggregate=None):
         """
         return self._zaggregate('ZUNIONSTORE', dest, keys, aggregate)
 
+    def zmscore(self, key, members):
+        """
+        Returns the scores associated with the specified members
+        in the sorted set stored at key.
+        ``members`` should be a list of the member name.
+        Return type is a list of score.
+        If the member does not exist, a None will be returned
+        in corresponding position.
+        """
+        if not members:
+            raise DataError('ZMSCORE members must be a non-empty list')
+        pieces = [key] + members
+        return self.execute_command('ZMSCORE', *pieces)
+
     def _zaggregate(self, command, dest, keys, aggregate=None,
                     **options):
         pieces = [command]

Diff for: tests/test_commands.py

@@ -1865,6 +1865,17 @@ def test_zunionstore_with_weight(self, r):
         assert r.zrange('d', 0, -1, withscores=True) == \
             [(b'a2', 5), (b'a4', 12), (b'a3', 20), (b'a1', 23)]
 
+    @skip_if_server_version_lt('6.1.240')
+    def test_zmscore(self, r):
+        with pytest.raises(exceptions.DataError):
+            r.zmscore('invalid_key', [])
+
+        assert r.zmscore('invalid_key', ['invalid_member']) == [None]
+
+        r.zadd('a', {'a1': 1, 'a2': 2, 'a3': 3.5})
+        assert r.zmscore('a', ['a1', 'a2', 'a3', 'a4']) == \
+            [1.0, 2.0, 3.5, None]
+
     # HYPERLOGLOG TESTS
     @skip_if_server_version_lt('2.8.9')
     def test_pfadd(self, r):